Study On Removal Of Typical Pesticides In Water By Advanced Treatment

With the rapid development of the population, the economy and the urbanization process in China, the emission of industrial, life and agricultural waste water increases every year, which has become an important reason for water pollution. And it has affected the safety of drinking water. Pesticide is one of the main organic pollutants in drinking water sources. At present, the water treatment technology in our country is mainly conventional treatment technology, namely: coagulation, sedimentation, filtration and disinfection. And this conventional treatment process cannot effectively remove pesticide residues in water, resulting in the presence of pesticide residues in tap water and drinking water quality risks. Therefore, the advanced treatment processing carried out for the protection of the drinking water safety is significant.In this paper, we choose five typical pesticides as the research objects because of the larger production and use and more residual water at the surface. It carried out the research to remove pesticides in water by advanced treatment technology of ozonation, activated carbon adsorption and nanofiltration. Studies have shown that: (1) in the bubble column ozone oxidation for 5 typical pesticides has a certain degree of removal. Reverse flow is better than co-current. With the increase of ozone dosage and ozone contact time, the removal of pesticides increases. The removal effect of pesticides by ozonation is as follows: Isoprothiolane>Imidacloprid>Atrazine>Fenobucarb; (2) activated carbon adsorption for 5 typical pesticides has a good performance. Activated carbon adsorption isotherm of pesticides removal conforms to the Langmuir model. Take atrazine for example, the penetration time of atrazine adsorbed by activated carbon is about 125h and capacity for atrazine is 1.44mg/L; (3)NF membranes have a good effect for four typical pesticides removal. At 2-8bar pressure condition, retention rate of typical pesticides increases with the increases of flux, retention rates of pesticides are:Isoprothiolane>Fenobucarb>Atrazine>Imidacloprid, and each retention rate is above 70%.